Safety device for locks



P. SCHOLL.

SAFETY DEVICE FOR LOCKS. I

APPLICATION mzu NOV. 10.11920.

1 79,048; P t nted May24,1921.

UNITED STATES PATENT OFFICE.

PAUL SCHOLL, or BERLIN, enrtmnm'r, Assmrion 'ro enns'r AHLEa'r, or sou'rn PASADENA, CALIFORNIA.

SAFETY DEVICE FOR LOCKS;

I Specification of Letters Patent.

Patented May 24, 1921.

Application filediNovember 10, 1920. Serial No. 423,178.

zen of Germany, residing at Berlin, Ger-.

many, have invented a new and useful Improvement in Safety Devices for Locks, of

which the following is a specification.

The invention relates to door locks and more particularly to a safety device for looks and doors of all kinds.

It is an object of the invention to provide a locking bolt adapted to engage the latch of a lock and releasable only by an extension of a key with which the lock is actuated.

It is a further object of the invention to provide on the inside of the door a plate which may be adjusted in position to pre vent or permit the extension of the key to: remove the locking bolt from engagement with the latch.

It is also an object of the invention to provide certain features of construction and .ar-

rangement whereby devices of the kind specified are rendered highly eiiicient and their desirability greatly enhanced.

To the accomplishment of the objects stated, and others that will become more, apparent as the description of the invention proceeds, a preferred embodiment of the invention is described in the following speci-' fication and particularly pointed out in the claims forming a part thereof.

The annexed drawing discloses a preferred embodiment of the invention without, however, exhausting the possible modificat ons which may be constructed on the prlnciple on which the present invention is predicated.

In the drawing;

Figure 1 is a fragmentary view. of the door provided with a lock and safety means in accordance'with the invention; i

Fig. 2 is a section onthe line 22 of Fig. 3 1s a viewsimilar to Fig. 2 withthe key inserted and the safety" means released Fig. l dlscloses several enlarged shapes of equipped with a circular aperture 5 originating, at the inner side of the door and extend mg to the look at right angles to the path of movement of the'latch. A sleeve 6 is arranged in the aperture 5 and receives a bolt 7 which adjacent to its operative end' is equipped with a disk '8', whereb the bolt s guided within the sleeve 6. he bolt 6 is formed at its inner end with a knob 9, and

interiorly of the sleeve a spring 10 bears a ainst the disk 8 and against the end wall 0 the sleeve 6, whereby the bolt is con tinuously forced toward the lock. The sleeve is secured to the door by a plurality of screws 12 threadedinto the door and extending through the end plate.

Fromv the foregoing, it is obvious that the bolt 7, under the influence of the spring 10,

r is forced. into an opening 4 of thelatch 2, so

that manipulation of the latchbymeans of a key is not possible unless the looking or safety belt 7 is withdrawn from the latch. As indicated in the sectional "iews, the bolt I 7 has pivotal-1y secured thereto a depending plate 13 which is arranged on the inner side of the door and COIlStltlltB'S an engagement meanswhereby the bolt 7 may be released from engagement with the latch 2 by an actuator introduced through the keyhole. This plate may, if desired, be manipulatedto be swung laterallyv out of alinement with the keyhole. 1 a

,As' indicated in Fig. 3, a key 14; has secured to its end a sleeve portion 15 which terminates in a solid pin 16 adapted to engage the plate 13 when the key is inserted through the keyhole 2; If it be desired to prevent the release of the bolt from the latch, such as is the case during the night, to

secure the look, a plate 17 is slidably mounted on the inner face of the door rearwardly of the plate 13 by means of a plurality of screws 18 which extend through slots 19' provided in the plate 17. In the position of plate-17, shown inFig. 1, an aperture 20 of the plate is in alinement with the path which the pin"v 16 takes upon insertion of the key and extension into thekeyhole. If, however,

the plate 17 is shifted laterally toward the left, as viewed in Fig. 1, the aperture 20 will not be in alinement with the pin 16 so that upon insertion of the key the pin 16 meets an unperforated portion of the plate 17 and, therefore, cannot engage the plate 13 to effect Withdrawal of the bolt and release of the latch.

The operation of the device is thought to be obvious from the foregoing description.

'Io manipulate the lock, the plate 17 is arranged to have its aperture 20 in registering position so that a key together with its extension upon introduction into the keyhole may pass through aperture 20 to force inwardly the depending plate 13 to withdraw the bolt 7 from the latch 3, whereupon the latch may be shifted in the ordinary manner to effect locking or unlocking of the door.

If, however, actuation of the lock is to be prevented, the access of the key extension to the depending plate 13 is prevented byv lat erally shifting the abutment plate 17,'so' that the extension 16 will meet with an uuper-,

forated part of the plate and will thereby be prevented from engaging the depending plate 13. As an additional precaution the depending plate 13 may be swung laterally clear of the keyhole 2.

The plate 17, instead of being provided with a circular aperture 20, may have irregular slots, two forms of which are shown in Fig. 4.

While the drawing discloses a preferred embodiment of the invention, it is not intended to limit the invention to the exact details of construction and arrangement, as

shown, but all modifications, alterations and changes are included, constituting departures within the scope of the invention, as indicated by the following claims:

I claim: 1. In combination with a door lock, hav ing a perforated latch, a bolt extending from the inner side of the door and adapted to enter an aperture in said latch, and means secured to the key for withdrawing the 'bolt from the latch and means for preventing access to said bolt by said key secured means.

2. In combination with a doorlock, having a perforated latch, a bolt extending from the inner side of the door and adapted to enter an aperture in said latch, a plate depending from said bolt at the inner end thercofto cover the keyhole, and means se-' cured to the key for engagement with said plate and withdrawal of said bolt and. means for preventing access to saidplate by said key secured means.

3. In combination with a door lock, having a perforated latch, a bolt extending from the inner side of the door and adapted to enter an aperture in said latch, a plate pivoted on said bolt at the inner end thereof to cover the keyhole, and means secured to the key for'engagement with said plate and withdrawal of said bolt.

4. In combination with a door lock, haV-' ing a perforated latch, a bolt extending from the inner side of the door and adapted to enter an aperture in said latch, a plate pivoted on said belt at the inner end thereof to cover the keyhole, and a detachable extension on the key for engagement with said plate and withdrawal of said bolt.

5. In combination with a door lock, having a perforated latch, a bolt extending from the inner side of the door and adapted to enter an aperture in said latch, a spring surrounding said bolt and engaging a shoulder thereon toforcc the same toward said latch, a plate pivoted on said bolt at the inner end thereof to cover the keyhole, and means secured to the key for engagement with said plate and withdrawal of said bull 6. In combination with a door lock having a perforated latch, a bolt extending from the'inner side of the door and adapted to enter an aperture in said latch, a plate de pending from said bolt at the-inner end thereof to cover the keyhole, a shift-able plate secured to the door rearwardly of said depending plate and having an aperture, and means secured to the key adapted to project through the aperture of said shiftable plate for engagement with said depending, plate and withdrawal of said bolt from said latch.

7. In combination with a door lock, having a perforated latch, a bolt extending from theinner side of the door and adapted to enter an aperture in said latch, a plate pivoted on said bolt at the inner end thereof to cover the keyhole, means secured to the key forengagement with said plate and withdrawal of said bolt from said latch, and means for respectively permitting and preventing access of said key-secured means to said depending plate. I

81' In combination with a door lock, having a perforated latch, a spring-controlled bolt extending from the inner side of the door and adapted to enter an aperture in said latch, a plate pivoted on said bolt at the inner end thereofto cover the keyhole, a shiftable plate secured to the door rearwardly of said depending plate and having an aperture, and means secured to the key adapted to project through the aperture of said shiftablc plate for engagement with said depending plate and withdrawal of said bolt from saidlatch.

In witness whereof I aflix mysignature.

' TPAUL SCHOLL. 

